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javascript: function upgrade(x, y) {
    if (mp < cellCost(x, y) || map[x][y][1] >= 15) return;
    var act = false;
    if (x - 1 > -1) {
        if (map[x - 1][y][0] == socketId) act = true
    }
    if (x + 1 < mapSize) {
        if (map[x + 1][y][0] == socketId) act = true
    }
    if (y - 1 > -1) {
        if (map[x][y - 1][0] == socketId) act = true
    }
    if (y + 1 < mapSize) {
        if (map[x][y + 1][0] == socketId) act = true
    }
    if (!act) return;
    mp += -cellCost(x, y);
    refresh();
    socket.emit('upgrade', x, y);
}